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Sudden death due to right ventricular cardiomyopathy
H Horiguchi1, S Misawa, T Ogata
1Department of Legal Medicine, University of Tsukuba, Japan.
Insights
Sudden cardiac death in a young man was linked to right ventricular cardiomyopathy, a condition where heart muscle is replaced by fat. Autopsy confirmed this rare disease, often diagnosed only after death.
Area of Science:
- Cardiology
- Pathology
Background:
- Sudden cardiac death (SCD) in young adults often lacks preceding clinical symptoms.
- Electrocardiogram (ECG) abnormalities, such as premature ventricular contractions, may be the only prior sign.
Observation:
- Autopsy of a 21-year-old man revealed significant cardiomegaly and right atrial/ventricular dilatation.
- The right ventricular myocardium showed extensive replacement by adipose tissue, with an additional fatty lesion in the ventricular septum.
Findings:
- Histological examination confirmed adipose tissue infiltration, characteristic of right ventricular cardiomyopathy.
- No congenital cardiac defects or inflammatory changes were identified, supporting a primary cardiomyopathic process.
Implications:
- Right ventricular cardiomyopathy is a critical diagnosis, often identified post-mortem due to sudden, unexpected death.
- Early recognition and diagnosis are vital for managing and potentially preventing SCD in affected individuals.
Abstract:
A 21-year-old man died suddenly at a small party. He had had no clinical signs of cardiac disease except for a slightly abnormal electrocardiogram (occasional premature ventricular contractions) since he was 15 years of age. Autopsy examination revealed cardiomegaly (469 g), with right atrial and ventricular dilatation. The right ventricular myocardium was massively replaced with adipose tissue, and there was one isolated fatty lesion in the right side of the ventricular septum. There were no congenital malformations such as a septal defect or valvular deformity. Histologically, muscular fibers remaining in the right ventricular wall showed neither degenerative nor inflammatory changes. An isolated lesion of the ventricular septum consisted of almost complete replacement of the muscle bundles with adipose tissue. Such a pathologic condition has recently been termed right ventricular cardiomyopathy. Postmortem examination is necessary to make a definite diagnosis of the disease, because in most adult cases of the disease, sudden death occurs before there have been any critical signs.